Electromagnetic valve.



No. 674,683. I l Patented may 2|, 190|. N. o. LlNnsTnoM.

ELEGTROMAINETIC VALVE'- (Application md Feb. 4, 1901.) (No Model.)

WITNESSES: '7' INVENTOR f 9 BY MMM y X-JUQRNEY THE Norms Pszns co, Puma-umu., WASHINGTON, u. cA

UNrTED STATESl ArrnNr Ormes.

NILS O. LINDSTROM, OF BOROUGH OF QUEENS, NEI/V YORK, N. Y., ASSIGNOR TO ALONZO B. SEE AND WALTER L. TYLER, OF SAME PLACE.

ELECTRONIAGNETIC VALVE.

SPECIFICATION forming part 0f Letters Patent NO. 674,683, dated May 21, 1901.

Application iiled February 4, 1901. Serial No. 45,846. (No model.)

To all whom it muy concern,.-

Be it known that I, NILs O. LINDsTRoM, a citizen of the United States, residing at the city of New York, in the borough of Queens and State of New York, have invented certain new and useful Improvements iu Electromagnetic Valves, of which the following is a full, clear, and exact description.

This invention relates to electromagnetic valves, and is designed to produce a valve for the control of air or gas for power purposes in which the magnet-coils are easily accessible and can be replaced or repaired when necessary without interference with the fluidconduits or subjecting the same to leakage.

A further object of the invention is to provide a valve which will open and close the respective ports positively and with certainty and which will prevent the useless exhaust` of air.

The invention consists of the details of construction hereinafter described and claimed.

In the accompanying drawings, Figure lis a vertical section through the entire valve apparatus, and Fig. 2 is a section on line ma: of Fig. l.

The electromagnet consists of two spools ct and a', surrounding iron cores b and b', connected together by a back-yoke b2. The magnet is located in a casing consisting of a baseplate C and a cover c, fitting on the plate. The base-plate is a casting provided with chambers and passages for the air or gas, into which the ends of the iron cores Z9 and b project and are fitted gas-tight. Opposite the end or pole piece of each core a cylindrical cavity is formed in the base-plate, said cavities being indicated by d and e, respectively. The face of the pole-piece constitutes one of the walls of the cavity, it being exposed therein. In each cavity are placed soft-iron cylindrical blocks f and f', respectively, constituting armatures for the magnet. The baseplate itself is made of brass or other nonmagnetic material, and the lines of force created by the magnet when energized lead through the two cores and directly across the space between the armatures. The armatures are made heavy to easily carry the lines of force and to act efficiently as valves, as will be hereinafter explained. The armatures normally rest upon the bottom of the chambers in which they are located, this bottom being furnished-by an extra plate g, attached to the main base-plate by screws or otherwise. The plate g is provided with a port or passage h, leading from the bottom of the cavity e through a portion of said plate, and is continued through the base-plate C by the passage i, thence through the pole-piece of the 6o core b, and into the cavity d through the center of the face of said pole-piece. An exhaustportj from the cavity YCZ is provided in the plate g. A passage le, supposed to connect with the source of air-pressure, leads into the side of the cavity e, and a lateral passage Z leads from the passage@ and is supposed to connect with any machine or apparatus to be operated by a pressure of air. The armature or valve f when in its normal position covers 7o and seals the port h and prevents the pressure of air which reaches the cavity c through the passage k from entering said port h. The upper surface of the armature f is provided with a number of non-magnetic studs 0, which prevent the armature from sticking to the face of the pole after it has been attracted thereto and the current cutoff. In the normal position of the armature f the passage is open to the atmosphere through 8o the face of the pole-pieces and the port j; but when said armature is lifted and held in contact with the pole-piece such communication is cut off and the exhaust of air prevented. In the normal position of the armatures the air gap or space between the upper surface of the armatures and their respective pole-pieces is smaller between the armature fand the pole b than between the armature f and the Vpole b', the result of which is that when the 9o magnet is energized the armature fwill be lifted a little before the armature f. On the other hand, when the magnet is denergized the armature j" will fall first, because it will turef being lifted slightly in advancel of the armature f and closing the exhaust-port to prevent escape of the air or gas. When the armature f finally lifts, the air or gas under pressure normally in the cavity e {iows in to the passage h and thence through the passage i and Z to the power device. When the work has been done and the circuit of the magnet opened, the armature f falls at once and closes the port h, thus preventing the flow of air or gas from the source into the passage t. Immediately thereafter the pressure remaining in the passage i and the action of gravity force the armatu ref away from the face of the pole b and open the passage i to the atmosphere. The air thus exhausting is only such air as was admitted to the power device. It will be seen here that if the armaturef opens the escape-port before the armature f cuts off the source of pressure some of the air direct-ly from the source would escape and become wasted. This might often happen if the armatures were constructed eX- actly alike and both were supposed to move together.

Havingl described my invention, I claiml. In an electromagnetic valve, the combination of an electromagnet, two armatures common thereto and one of which controls a supply-port and the other an exhaust-port, a chamber or passage connecting said supply and exhaust ports, and another passage leading from said connecting-passage to an apparatus to be operated, substantially as described.

2. In an electromagnetic valve, the combination of an electromagnet, two armatures common thereto and respectively controlling supply and exhaust ports for t-he same chamber or passage, and means whereby one of the armatures will move before the other.

3. In an electromagnetic valve, the combination of an electromagnet having two polepieces, two armatures for the respective polepeces, and supply and exhaust ports for a common chamber or passage respectively controlled by said armatures, substantially as described.

4. In an electromagnetic valve, the combination of an electromagnet having two polepieces, two armatures for the respective polepieces, supply and exhaust ports for a common chamber yor passage respectively controlled by said armatures, and means whereby one armature will move before the other when the circuit of the magnet is affected.

5. In an electromagnetic valve, the combination of an velectromagnet having two polepieces, two armatures respectively adapted to said pole-pieces, supply and exhaust ports for a common chamber' or passage respectively controlled by said armatures, the air gap or space between the armatures and their pole-pieces being smaller in one instance than in the other.

In witness whereof I subscribe my signature in presence of two witnesses.

NILS O. LINDSTROM.

Witnesses:

` WM. A. RosENBAUM, WALDo M. CHAPIN. 

